Improved compound for printers  ink



nnunrtonwnnnnne, on NEW YORK, Y.

Letters Patent No. 104,862, dated June 28, 1870.

IMPROVED COMPOUND POR'PRINZERS' INK. I

The Schedule referred to in these Letters Patent and making part of thesame,

To all whom it may concern:

Be it known that I, HENRY Lonwnnnnne, of the city, county, and State ofNew York, have invented a new and improved Compound for Printers Ink;'and I do hereby declare the following to be a full, clear, and exactdescription thereof, which will enable those skilled in the art to makeand use the same.

This invention consists in" a compound made by adding to the ingredientscomposing ordinary or soluble printers ink, prussiate of potash, in sucha manner that the ink'is rendered more soluble than without suchaddition, as hereinafter described.

In carrying out my invention, I take,'for instance, prussiate of potash,and'mix the same, eitherin adry state or in solution with theingredients usually employed for making printers ink, about in thefollowing proportion:

Printers ink, one. hundred parts; prussiato of potash, five to twentyparts; and with this ink 1 print on the paper or other material which isto be used for check, drafts, stamps,bond s, or other documents ofvalue, any suitable design. Over this design the figures, words, ornumbers expressing the value'or the current numbers of the docurnent, orserving tocancel the same, are writtenwith common writing-ink, and if anattempt is made to erase by chemicals, such as oxalic acid, nitric acid,or potash, the words or figures thus written, the color of the designprinted with my compound is changed immediately, and the fraud isdetected.

I am aware that it is not new to form a compound of iodide 'of potash orbromide of potassium, mixed with water, so as to discolor the surfacewhen an attempt is made to extract figures; such I do not claim; but

What I claim as new, and desire to secure by Letters Patent, is

The compound for printers ink, made by adding to the ingredientscomposing ordinary or soluble printers ink, prnssiate of potash, asherein described, and

about in the proportions specified. Y

This specification signed by me this 15th day of April, 1870.

HENRY LOEWENBERG.

Witnesses:

W. HAUFF, O. WAHLERS.

